SmartGWT has been migrated to GitHub from Google Code as Google will be switching projects to "read only" on 8/24/2015 and shutting down the service on 1/25/2016. If you notice something that doesn't seem to have been migrated properly, let us know. If a new issue needs to be created, it should be created on the GitHub site.
While GitHub supports svn access to projects and standard svn commands, we've found that 'svn log' appears to have some issues. We therefore recommend using the native git command APIs. If you don't already have a git client, check https://git-scm.com/downloads.
To build from source, see the wiki inside the project.